418531 ภาคต้น 2552/โจทย์ปัญหาการพิสูจน์ II/เฉลยข้อ 4

ข้อย่อย 1

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Request served via cp5021 cp5021, Varnish XID 787110746
Upstream caches: cp5021 int
Error: 429, Too many requests (f061ab2) at Thu, 23 Apr 2026 18:52:59 GMT


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$a_{n}={\begin{cases}-2,&n=0\\a_{n-1}+4,&n>0\end{cases}}$

ข้อย่อย 3

$a_{n}={\begin{cases}2,&n=0\\a_{n-1}+2\cdot (-1)^{n},&n>0\end{cases}}$

ข้อย่อย 4

$a_{n}={\begin{cases}0,&n=0\\a_{n-1}+2n-1,&n>0\end{cases}}$